reverse_geocoder

When you use this function in a query, it takes the latitude and longitude values in a dataset and returns information such as ISO 3166-1 alpha-3 codes or a country name based on the shapes available in the layer referenced in the query rule.

In this case, the params values specify that the layer here_country is used to determine the owning administrative entity of the geocoordinates defined by the latitude and longitude values. This layer provides country names, HERE IDs, and ISO 3166-1 alpha-3 country codes. If you changed the query above to the following query rule, then the response contains the country names.